package com.ruoyi.client.utils;

import com.fasterxml.jackson.annotation.JsonIgnore;

import java.util.ArrayList;
import java.util.List;

public class PageListUtil<T>{
   private Integer pageNo;
   private Integer total;
   private Integer pages;
   @JsonIgnore
   private Integer pageSize;
   private List<T> records;
  
  public PageListUtil(List<T> list, Integer pageNo, Integer pageSize){
	  this.pageNo = pageNo;
	  this.pageSize = pageSize;
	  this.total = list.size();
	  boolean full = total%pageSize == 0;
  if(!full){
	  this.pages = total/pageSize + 1;
  }else{
 	 this.pages = total/pageSize;
  }
	  int fromIndex = 0;
	  int toIndex = 0;
	  fromIndex = pageNo * pageSize - pageSize;
  if(pageNo == 0){
  	throw new ArithmeticException("第0页无法显示");
  }else if(pageNo > pages){
  	list = new ArrayList();
  }else if(pageNo == pages){
  	toIndex = total;
  }else{
  	toIndex = pageNo * pageSize;
  }
  if(list.size() == 0){
  	this.records = list;
  }else{
  	this.records = list.subList(fromIndex,toIndex);
  }
  }
  public Integer getPageNo(){return pageNo;}
  public void setPageNo(Integer pageNo){this.pageNo = pageNo;}
  public Integer getTotal(){return total;}
  public void setTotal(Integer total){this.total = total;}
  public Integer getPages(){return pages;}
  public void setPages(Integer pages){this.pages = pages;}
  public Integer getPageSize(){return pageSize;}
  public void setPageSize(Integer pageSize){this.pageSize = pageSize;}
  public List<T> getRecords(){return records;}
  public void setRecords(List<T> list){this.records = list;}
}
